WO2020115908A1 - 端末及び通信方法 - Google Patents

端末及び通信方法 Download PDF

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Publication number
WO2020115908A1
WO2020115908A1 PCT/JP2018/045161 JP2018045161W WO2020115908A1 WO 2020115908 A1 WO2020115908 A1 WO 2020115908A1 JP 2018045161 W JP2018045161 W JP 2018045161W WO 2020115908 A1 WO2020115908 A1 WO 2020115908A1
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WO
WIPO (PCT)
Prior art keywords
terminal
base station
transmission
srs
parameter
Prior art date
Application number
PCT/JP2018/045161
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English (en)
French (fr)
Japanese (ja)
Inventor
浩樹 原田
聡 永田
Original Assignee
株式会社Ｎｔｔドコモ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社Ｎｔｔドコモ filed Critical 株式会社Ｎｔｔドコモ
Priority to US17/297,168 priority Critical patent/US20220022220A1/en
Priority to CN201880099993.9A priority patent/CN113196855B/zh
Priority to JP2020558791A priority patent/JP7217291B2/ja
Priority to PCT/JP2018/045161 priority patent/WO2020115908A1/ja
Priority to EP18942213.2A priority patent/EP3893580A4/en
Publication of WO2020115908A1 publication Critical patent/WO2020115908A1/ja

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices

Definitions

  • the present disclosure relates to terminals and communication methods.
  • LTE Long Term Evolution
  • Non-patent Document 1 LTE successor systems include, for example, LTE-A (LTE-Advanced), FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G+ (5G plus), New-RAT (Radio Access Technology; NR). There is something called.
  • One of the purposes of the present disclosure is to improve the throughput of the uplink.
  • a terminal includes a control unit that applies a second transmission parameter different from a first transmission parameter corresponding to a reception parameter used for downlink reception to uplink transmission, and the second transmission parameter. And a transmitter for performing the uplink transmission by using the transmitter.
  • uplink throughput can be improved.
  • FIG. 11 is a diagram showing an example of frequency bands assigned to the terminal according to the third embodiment. It is a figure which shows an example of the hardware constitutions of a base station and a terminal.
  • MIMO Multiple Input Multiple Output
  • CA Carrier Aggregation
  • CCs component carriers
  • high-order multi-valued Modulation or wideband transmission may be used.
  • a terminal which may be referred to as a user terminal or UE (User Equipment)
  • UE User Equipment
  • CA in addition to the increase in terminal cost, size, and power consumption due to signal processing of multiple carriers (for example, CC), for example, increase in PAPR (Peak to Average Power Ratio) or mutual
  • PAPR Peak to Average Power Ratio
  • IM Intermodulation
  • FIG. 1A shows an example of transmission power of a terminal in narrowband transmission
  • FIG. 1B shows an example of transmission power of a terminal in wideband transmission.
  • the wider the communication bandwidth of the UL signal the smaller the transmission power per unit band (for example, PSD (Power Spectral density)), and the communication range (for example, called coverage). It tends to be narrow.
  • the higher the multi-level number (order) of the UL signal the higher the reception quality is required, and the coverage that can use the multi-level number is likely to be narrow.
  • FIG. 2 shows a configuration example of a wireless communication system including a base station that covers a certain DL area and terminals existing in the DL area.
  • the terminal shown in FIG. 2 wirelessly connects (or accesses) a base station, receives a DL signal, and transmits a UL signal.
  • FIG. 3 shows an example of the configuration of a wireless communication system in which base stations are densely arranged as compared with FIG.
  • the terminal shown in FIG. 3 wirelessly connects (or accesses) at least one of a plurality of base stations arranged in high density.
  • the terminal transmits a UL signal by, for example, wideband single carrier transmission.
  • Single-carrier transmission enables wideband transmission without applying CA, for example, and improves UL throughput.
  • the terminal 30 may use a relatively high frequency band (for example, a frequency band of 3.5 GHz or higher) in wideband transmission.
  • the high-density arrangement of base stations as shown in Fig. 3 increases cost or processing time. Further, in the case of increasing the density of the base stations in stages, for example, each time the arrangement of the base stations is changed (for example, addition, change or deletion), the antenna tilt of the base station is changed, or the interference of the DL is adjusted. The parameter of will be changed.
  • the terminal 30 is wirelessly connected to a base station 10 (details will be described later) forming a DL area in the DL, and a base station 20 densely arranged in the DL area in the UL (details will be described later).
  • the base station to which the terminal 30 connects in DL and the base station to which the terminal 30 connects in UL may be different.
  • the base station 20 does not have a configuration related to DL wireless processing (in other words, wireless transmission processing), but has a configuration related to UL wireless processing (in other words, wireless reception processing) (in other words, UL reception). It is a dedicated station). In this case, even if the arrangement of the base station 20 is changed (for example, the base station 20 is added, changed, or deleted), the DL communication by the base station 10 is not affected, and the DL interference at the base station 10 is not affected. Parameters such as adjustment will not be changed. Further, when the base station 20 is a UL reception-only station, DL transmission is not performed, so that acquisition of a radio license or interference adjustment for the base station 20 is unnecessary, and the station placement procedure or design of the base station 20 is simplified.
  • UL beam control for example, UL beam management
  • a beam control method for example, called beam correspondence
  • the terminal sets a DL beam (in other words, a reception beam of the terminal) using a DL reference signal (Reference Signal) (for example, SSB (Synchronization Signal Block)) transmitted from the base station.
  • a DL reference signal Reference Signal
  • SSB Synchronization Signal Block
  • the terminal sets a beam in the same direction as the set reception beam as a beam for UL (in other words, a transmission beam of the terminal).
  • the transmission parameter corresponding to the reception parameter used for the DL beam control is used in the UL beam control (in other words, the UL transmission of the terminal). Be done.
  • the terminal 30 sets a transmission beam for the base station 10 connected in the DL and the base station 20 in a direction different from that of the base station 10. There is a possibility that the transmission beam toward the target is not set. If the transmission beam directed to the base station 20 is not set appropriately, the base station cannot receive even if the terminal performs UL transmission using wideband and high-order multi-level modulation, and the UL throughput decreases.
  • the wireless communication system according to the present embodiment includes, for example, as shown in FIG. 4, a base station 10, a base station 20, and a terminal 30.
  • the configuration of the wireless communication system shown in FIG. 4 is an example.
  • the number of each of the base station 10, the base station 20, and the terminal 30 is not limited to the number shown in FIG.
  • the base station 10 transmits a DL signal to the terminal 30.
  • the base station 20 also receives the UL signal transmitted from the terminal 30.
  • the terminal 30 receives the DL signal transmitted from the base station 10 and transmits the UL signal to the base station 20.
  • the base station 10 and the base station 20 are connected by a wired or wireless network (for example, called a backhaul) (not shown).
  • the base station 20 transmits the UL signal received from the terminal 30 or the control information generated by using the UL signal to the base station 10.
  • FIG. 5 is a block diagram showing a configuration example of base station 10 according to the present embodiment.
  • the base station 10 includes, for example, a control unit 101 and a transmission unit 102.
  • FIG. 5 illustrates a configuration unit in which the base station 10 transmits a DL signal
  • the base station 10 may include a reception unit that receives a UL signal (not shown).
  • the base station 10 may receive the UL signal transmitted from the terminal 30 in the receiving unit.
  • the control unit 101 controls the transmission process in the transmission unit 102.
  • the control unit 101 controls the transmission of the control information addressed to the terminal 30 in the transmission unit 102.
  • the control unit 101 uses the UL signal (or information based on the UL signal) transferred from the base station 20 so that the beam used by the terminal 30 (for example, a UL transmission beam) or the base station 20 Control the beam used (eg, the UL receive beam).
  • the control unit 101 controls a random access (RA (Random Access)) process for the terminal 30.
  • RA Random Access
  • the transmitting unit 102 transmits a signal for the terminal 30 (DL signal) to the terminal 30.
  • the transmission unit 102 transmits the DL signal under the control of the control unit 101.
  • the DL signal includes, for example, DL data (eg, sometimes referred to as PDSCH (Physical Downlink Shared Channel) signal), DL control information (eg, DCI (Downlink Control Information)), or a reference signal.
  • DL control information includes, for example, an RA message including a TA (Timing Advance) command (which may also be referred to as a RAR (Random Access Response) or message 2) and information indicating the resource setting of the UL reference signal.
  • the UL reference signal is, for example, SRS (Sounding Reference Signal).
  • the DL control information may be notified to the terminal 30 by upper layer signaling, or may be notified to the terminal 30 by dynamic signaling such as DCI.
  • the upper layer signaling may be called RRC (Radio Resource Control) signaling or an upper layer parameter, for example.
  • FIG. 6 is a block diagram showing a configuration example of base station 20 according to the present embodiment.
  • the base station 20 includes, for example, a control unit 201 and a receiving unit 202.
  • the control unit 201 controls the reception process in the reception unit 202.
  • the control unit 201 controls reception of UL signals (for example, reference signals such as SRS).
  • the control unit 201 controls transmission of the UL signal received from the terminal 30 or the control information generated using the UL signal to another base station (for example, the base station 10).
  • the receiving unit 202 receives a signal (UL signal) transmitted from the terminal 30.
  • the receiving unit 202 receives the UL signal under the control of the control unit 201.
  • the UL signal includes, for example, a reference signal (for example, SRS), an RA signal, and UL data (for example, sometimes called a PUSCH (Physical Uplink Shared Channel) signal).
  • a reference signal for example, SRS
  • RA Radio Resource Control
  • UL data for example, sometimes called a PUSCH (Physical Uplink Shared Channel) signal.
  • FIG. 7 is a block diagram showing an example of the configuration of terminal 30 according to the present embodiment.
  • the terminal 30 includes, for example, a control unit 301, a reception unit 302, and a transmission unit 303.
  • the control unit 301 controls, for example, the reception process in the reception unit 302 and the transmission process in the transmission unit 303.
  • the control unit 301 controls the transmission beam used for SRS transmission.
  • the control unit 301 sets a transmission beam toward the base station 10 or the base station 20 based on the control information notified from the base station 10, for example.
  • the control unit 301 may set a transmission beam directed to any one of the base station 10 and the plurality of base stations 20 illustrated in FIG. 4, or may set a transmission beam directed to a plurality of base stations. You may.
  • control unit 301 detects a TA command from the received DL signal and adjusts the communication timing of the UL signal using the detected TA command.
  • the receiving unit 302 receives the DL signal transmitted from the base station 10. For example, the receiving unit 302 receives the DL signal under the control of the control unit 301.
  • the transmitting unit 303 transmits the UL signal to the base station 20.
  • the transmission unit 303 transmits the UL signal under the control of the control unit 301.
  • the transmission unit 303 transmits the UL signal using the transmission beam instructed by the control unit 301.
  • the terminal 30 transmits the SRS while switching, for example, a plurality of transmission beams (in other words, SRS resources) in order to set the transmission beam toward the base station 20 that is the transmission destination of the UL signal (beam sweeping). Sometimes called).
  • the network side (for example, the base station 10 or the base station 20) sets at least one transmission beam from the plurality of transmission beams using the SRS measurement value received by the base station 20. For example, the network side may set, in the terminal 30, at least one transmission beam whose SRS measurement value is equal to or greater than the threshold value.
  • the base station 10 notifies (in other words, instructs) SRS resource information (which may also be referred to as SRS resource or SRS resource set) to the terminal 30.
  • SRS resource information may be notified using at least one of higher layer signaling and dynamic signaling.
  • the SRS resource information includes, for example, the transmission beam (for example, beam number or SRS resource number) of the terminal 30 and the transmission timing (in other words, time resource) of the SRS corresponding to each transmission beam.
  • FIG. 8 shows an example of SRS resources set in the terminal 30.
  • the beam number may be called a resource number (or resource ID).
  • the transmission timing (in other words, time resource) of the SRS corresponding to each transmission beam of beam numbers 1 to 8 is set in the terminal 30.
  • the terminal 30 After receiving the SRS resource information from the base station 10, the terminal 30 transmits the SRS based on the SRS resource information.
  • the terminal 30 transmits the SRS in the order of the transmission beams of beam numbers 1 to 8 at the transmission timing corresponding to each transmission beam.
  • the network side selects the transmission beam used by the terminal 30 using, for example, the measured value of SRS (for example, received power value) at each base station 20.
  • the base station 10 selects, from among the plurality of transmission beams (transmission beams of beam numbers 1 to 8 in FIG. 8 ), a transmission beam corresponding to an SRS having a higher SRS measurement value received by the base station 20,
  • the transmission beam used by the terminal 30 is determined.
  • the base station 10 notifies the terminal 30 of information indicating the determined transmission beam (for example, beam number or SRS number (for example, SRS-ResourceID) corresponding to the selected beam).
  • the terminal 30 sets a transmission beam based on the information indicating the transmission beam notified from the base station 10. Then, the terminal 30 performs beamforming using the set transmission beam and transmits a UL signal (for example, a PUSCH signal or RA signal) to the base station 20.
  • a UL signal for example, a PUSCH signal or RA signal
  • the terminal 30 controls the transmission beam different from the transmission beam for the DL in transmitting the UL signal. it can.
  • the terminal 30 can transmit the UL signal by directing the transmission beam to the base station 20 having higher reception quality with the terminal 30 in the UL, for example, and thus the throughput of the UL can be improved.
  • FIG. 8 is an example, and the number of SRS transmission beams set in the terminal 30 is not limited to eight, and another number of transmission beams may be set in the terminal 30.
  • the time resource to which the SRS for beam sweeping is mapped may be a continuous resource (for example, continuous slots) or a non-continuous resource (for example, a non-continuous slot).
  • the timing at which the terminal 30 transmits the SRS may be notified to the terminal 30 by, for example, SRS resource information (for example, resourceType).
  • SRS resource information for example, resourceType
  • the timing of transmitting the SRS may be, for example, periodic or aperiodic, or may be set semi-persistent.
  • Beam sweeping instruction method Next, an example of a method of instructing the terminal 30 from the base station 10 regarding the above-mentioned transmission beam control (for example, beam sweeping) will be described.
  • a parameter (for example, “usage”) indicating the purpose of resource setting is defined in the parameters included in SRS resource information (for example, SRS resource set).
  • SRS resource information for example, SRS resource set.
  • the terminal performs beam sweeping using SRS.
  • the base station to which the terminal wirelessly connects is the same for DL and UL and different cases.
  • the pattern or number of transmission beams (in other words, transmission beam candidates or SRS resource candidates) applied to SRS in the transmission beam control of each case is different.
  • the terminal 30 has a beam in the same beam direction as the reception beam set in the terminal 30 in the DL, or a specific beam.
  • the beam in the direction of is selected as the UL transmission beam.
  • the terminal 30 selects a transmission beam (for example, all transmission beams) that the terminal 30 can select for UL.
  • SRS is transmitted (beamsweeping) using a beam.
  • the purpose of SRS beam control (beam sweeping) is set to DL and UL for the base station wirelessly connected to the terminal 30.
  • the information for distinguishing in other words, identifying or determining) the same case and different cases may be included.
  • the parameters regarding the beam control of the SRS signaled from the base station 10 to the terminal 30 include the SRS transmission control from the terminal 30 to the base station 10 and the SRS transmission control from the terminal 30 to the base station 20, Information (in other words, information for distinguishing the destination of the SRS) is included.
  • the parameter (for example, usage) indicating the usage of the SRS resource setting defined in the 3GPP standard defines different values in the same and different cases in which the base station wirelessly connected to the terminal 30 is DL and UL. May be.
  • the terminal 30 sets the transmission beam of the SRS (in other words, the SRS resource) according to the parameter (for example, usage) indicating the usage of the resource setting of the SRS.
  • the parameter indicating the use of the SRS resource setting in the same case where the base station wirelessly connected to the terminal 30 is DL and UL is reused even in the case where the base station wirelessly connected to the terminal 30 is different in DL and UL. May be done.
  • a parameter for identifying two cases of the base station to which the terminal 30 wirelessly connects in UL is The station 10 may notify the terminal 30.
  • a parameter for causing the terminal 30 to recognize whether or not the terminal 30 performs beam sweeping using a plurality of beams (for example, all beams) to the base station 20 is transmitted from the base station 10 to the terminal 30. You may be notified.
  • the parameter indicating whether or not the terminal 30 performs beam sweeping using a plurality of beams may be explicitly notified from the base station 10 to the terminal 30.
  • the terminal 30 uses the beam sweeping ( For example, refer to FIG.
  • the terminal 30 indicates that the parameter indicating the use of the SRS resource setting is beam sweeping and the parameter that is explicitly notified indicates that beam sweeping using a plurality of beams is not performed, Perform beam sweeping (not shown).
  • the parameter indicating whether or not the terminal 30 performs beam sweeping using a plurality of beams to the base station 20 may be implicitly notified from the base station 10 to the terminal 30.
  • a parameter eg, spatialRelationinfo
  • SRS resource information eg, SRS resource
  • the parameter related to the spatial area of SRS includes, for example, information indicating a beam used for a reference signal such as SSB (synchronization Signal Block), CSI-RS (Channel State Information Reference Signal), or SRS.
  • SSB synchronization Signal Block
  • CSI-RS Channel State Information Reference Signal
  • SRS Signal State Information Reference Signal
  • the terminal 30 switches the beam control (beam sweeping) of the SRS according to the parameter related to the spatial area of the SRS. For example, when a value is not set for the parameter related to the spatial area of SRS, the terminal 30 recognizes that SRS beam sweeping (eg, omnidirectional beam sweeping) has been instructed to the base station 20 (in other words, determination or determination). To do.
  • SRS beam sweeping eg, omnidirectional beam sweeping
  • the terminal 30 uses the value (for example, the beam used for the DL reference signal) indicated in the parameter related to the spatial region of SRS, and the base station Recognize that SRS beam sweeping for 10 was instructed.
  • the terminal 30 instructs the base station 20 to perform SRS beam sweeping when the SRS resource information indicates the same number of SRS resources as the number of transmit beams that can be set in the terminal 30. You may recognize that it was done.
  • eight beams (in other words, SRS resources) can be set to the terminal 30.
  • the terminal 30 recognizes that SRS beam sweeping (for example, omnidirectional beam sweeping) is designated to the base station 20.
  • SRS beam sweeping for example, beam sweeping in a specific direction
  • the signaling to the terminal 30 can be reduced by such an implicit notification.
  • the implicit notification is not limited to the above example.
  • the implicit notification is a notification of information that allows the terminal 30 to recognize which of the base station 10 and the base station 20 to perform SRS beam sweeping (in other words, information that can determine the transmission destination of UL transmission). I wish I had it.
  • the terminal 30 may report the number of beam patterns for SRS beam sweeping to the network.
  • the terminal capability information (UE capability) of the terminal 30 may include the number of beam patterns for SRS beam sweeping.
  • the network (for example, the base station 10) may determine the SRS resource setting for the terminal 30 based on the number of SRS beam sweeping beam patterns indicated in the terminal capability information reported from the terminal 30. .. In other words, the network (for example, the base station 10) can determine whether or not the terminal 30 can perform wideband transmission based on the number of beam patterns for SRS beam sweeping indicated by the terminal capability information reported from the terminal 30.
  • the base station 20 receives the SRS while switching, for example, a plurality of reception beams (in other words, SRS resources) in order to set the reception beam toward the terminal 30 that is the transmission source of the UL signal (beam sweeping). Sometimes called).
  • the terminal 30 repeatedly transmits (in other words, repetition transmission) the number of SRSs corresponding to the number of reception beams switched by the base station 20, using at least one transmission beam in a specific direction.
  • the base station 10 notifies the terminal 30 of SRS resource information (for example, SRS resource set) including parameters regarding the reception beam set in the base station 20.
  • SRS resource information includes at least information on SRS reception control (for example, reception beam control) in the base station 20.
  • the SRS resource information includes a transmission beam (for example, a beam number or an SRS resource number) of the terminal 30 and an SRS transmission timing (in other words, a time resource).
  • a transmission beam for example, a beam number or an SRS resource number
  • an SRS transmission timing in other words, a time resource
  • the transmission beam set in the terminal 30 may be, for example, the transmission beam set by the above-mentioned transmission beam control. For example, even if the transmission beam set in the terminal 30 (for example, SRS ResourceId indicating the SRS resource corresponding to the transmission beam) is set in the parameter related to the spatial area of the SRS of the SRS resource information (for example, spatialRelationInfo of SRS resource) Good.
  • FIG. 9 shows an example of SRS resources set in the terminal 30.
  • a transmission beam in one specific direction (in other words, an SRS resource) is set in the terminal 30. Further, in FIG. 9, since the base station 20 uses the reception beams in four directions, four SRS resources (in other words, transmission timing or time resources) are set in the terminal 30.
  • the terminal 30 After receiving the SRS resource information from the base station 10, the terminal 30 transmits the SRS based on the SRS resource information. For example, in FIG. 9, the terminal 30 repeatedly transmits four SRSs, which is the same number as the number of reception beams set in the base station 20, using a specific transmission beam.
  • the base station 20 receives the SRSs at the reception timings corresponding to the respective reception beams in the order of the reception beams having the set beam numbers 1 to 4.
  • the base station 20 selects a reception beam to be used for receiving the UL signal based on the SRS measurement value (for example, reception power value) received using each reception beam.
  • the reception beam selection process may be performed by another base station (for example, the base station 10) different from the base station 20.
  • the application of the SRS beam control (beam sweeping) is discriminated (in other words, identification or discrimination) in the SRS resource information from the base station 10 to the terminal 30. Information for doing so may be included.
  • a value indicating that the base station 20 performs beam sweeping using a plurality of reception beams may be defined in a parameter (for example, usage) indicating the purpose of SRS resource setting.
  • a parameter for example, usage
  • the second transmission parameter (for example, the base station) different from the first transmission parameter corresponding to the reception parameter used for DL reception (for example, the parameter regarding the transmission beam corresponding to the reception beam in DL) is used.
  • Parameters on the transmit beam for 20) apply to UL transmission.
  • the terminal 30 controls the transmission destination of UL transmission (for example, the base station 10 or the base station 20) based on the information for distinguishing the transmission destination of the SRS and the resource information of the SRS.
  • the terminal 30 transmits a UL signal to the base station 20 capable of wideband transmission, even if the direction of the base station 10 connected in the DL and the direction of the base station 20 are different, the base station It is possible to set transmission beams corresponding to 20 directions. With this setting, the terminal 30 can, for example, perform wideband transmission to the base station 20 and improve the UL throughput.
  • the terminal 30 controls the repetition of UL transmission (for example, the number of repetitions) based on the parameter indicating the use of SRS or the resource information of SRS.
  • the reception beam in the base station 20 capable of wideband transmission can be appropriately set in the direction of the terminal 30.
  • the terminal 30 can, for example, perform wideband transmission to the base station 20 and improve the UL throughput.
  • the base station and the terminal according to the present embodiment have the same basic configuration as the base station 10, the base station 20 and the terminal 30 according to the first embodiment, and therefore FIG. 5, FIG. 6 and FIG. explain.
  • the terminal 30 when the base station connected in the terminal 30 in the DL is different from the base station connected in the UL, the terminal 30 performs the initial connection with the base station 10 for adjusting the transmission timing of the UL. Separately, TA control for the base station 20 is performed. In other words, the terminal 30 transmits a PRACH (Physical Random Access Channel) signal (also referred to as RA preamble or Message 1) to the base station 20.
  • PRACH Physical Random Access Channel
  • the base station 20 uses the PRACH signal transmitted from the terminal 30 to set the TA value of the terminal 30.
  • the TA value of the terminal 30 may be set by the base station 10 instead of the base station 20.
  • the base station 10 transmits to the terminal 30 a signal (also referred to as RAR or message 2) including a TA command indicating the TA value set in the terminal 30.
  • the terminal 30 adjusts the transmission timing of the UL signal to the base station 20 based on the received TA value.
  • CBRA contention based random access
  • Connected mode for example, Idle mode or Inactive mode
  • CFRA contention free random
  • the base station 10 notifies the terminal 30 of control information related to beam control (for example, beam sweeping) of the PRACH signal transmitted to the base station 20 by using broadcast information or higher layer signaling.
  • control information related to beam control for example, beam sweeping
  • the control information includes, for example, information indicating resource settings (for example, beam number (or resource number) and time resource, etc.) for transmitting the PRACH signal, similar to the transmission beam control of the SRS according to the first embodiment. ..
  • the terminal 30 transmits the PRACH signal using at least one transmission beam based on the control information notified from the base station 10.
  • beam sweeping of the PRACH signal may be performed for at least one PRACH format.
  • the terminal 30 may transmit a plurality of PRACH signals using different transmission beams in at least one PRACH format. Therefore, the PRACH signal may be collectively transmitted using a plurality of transmission beams in at least one transmission process of the PRACH signal.
  • the terminal 30 can transmit the PRACH signal using a plurality of transmission beams in one or a plurality of PRACH formats. Therefore, the efficiency of RA processing can be improved.
  • the PRACH resource may be set by the upper layer signaling for the terminal 30 in the connected mode.
  • a PRACH resource for CFRA contention free random access
  • CFRA contention free random access
  • the base station 10 notifies the terminal 30 of resource information indicating the PRACH resource for the terminal 30.
  • the resource information indicating the PRACH resource includes, for example, information indicating the transmission beam used for transmitting the PRACH signal.
  • the transmission beam used for transmitting the PRACH signal is, for example, the transmission beam selected by the beam sweeping of the SRS described in the first embodiment.
  • the transmission beam selected by the beam sweeping of SRS may be set in the parameter related to the spatial domain (for example, spatialRelationInfo).
  • the terminal 30 sets the transmission beam of the PRACH signal based on the resource information indicating the PRACH resource, and transmits the PRACH signal using the set transmission beam.
  • terminal 30 has the second transmission parameter (different from the first transmission parameter corresponding to the reception parameter used for DL reception (for example, the parameter regarding the transmission beam corresponding to the reception beam in DL))
  • the parameters regarding the transmission beam of the PRACH signal are applied to UL transmission.
  • the terminal 30 transmits the PRACH signal based on the resource information for transmitting the PRACH signal to the base station 20, and controls the timing of UL transmission.
  • the terminal 30 can appropriately transmit the PRACH signal to the base station 20 even when the direction of the base station 10 and the direction of the base station 20 connected in the DL are different.
  • the terminal 30 can improve the UL throughput, for example, by appropriately adjusting the transmission timing of the UL signal to the base station 20 and performing wideband transmission.
  • the base station and the terminal according to the present embodiment have the same basic configuration as the base station 10, the base station 20 and the terminal 30 according to the first embodiment, and therefore FIG. 5, FIG. 6 and FIG. explain.
  • TDD Time Division Duplex
  • BWP bandwidth part
  • a terminal in which a narrow band carrier (100 MHz/CC as an example) is set in UL and a wide band carrier (400 MHz/CC as an example) is set in UL is set in UL.
  • a narrow band carrier 100 MHz/CC as an example
  • a wide band carrier 400 MHz/CC as an example
  • FIG. 10 shows an example of a frequency band assigned to a terminal in which a narrow band carrier is set in the UE.
  • the band of 4 CC is set by the CA in the DL (for example, 100 MHz ⁇ 4 CC), and the band of any one of the 4 CC is set in the UL (100 MHz ⁇ 1 CC).
  • FIG. 11 shows an example of a frequency band assigned to a terminal in which a wide band carrier is set in the UE.
  • a 4 CC band is set by CA (for example, 100 MHz ⁇ 4 CC)
  • one CC band corresponding to 4 CC is set (400 MHz ⁇ 1 CC). ..
  • the DL frequency band configuration in FIGS. 10 and 11, a plurality of CCs of 100 MHz per CC may be the same. It is preferable from the viewpoint of DL scheduling.
  • the frequency band configuration (in other words, the CC configuration) may be different between the DL and the UL.
  • different center frequencies may be set between UL and DL in the frequency band (for example, BWP) of terminal 30 in which a wide band carrier is set in UL.
  • the terminal 30 to which the wide band carrier is set in UL can be set without being constrained by the constraint that the center frequencies of the DL and UL frequency bands in TDD are aligned.
  • the terminal capability information (for example, UE capability) of the terminal 30 may include information indicating whether to allow different center frequencies of the DL and UL frequency bands.
  • the network side determines a frequency band to be assigned to the terminal 30 (for example, the frequency band shown in FIG. 10 or 11) based on the terminal capability information of the terminal 30.
  • the DL and UL bands with the same center frequency (Referred to as BWP).
  • the frequency band (in other words, BWP) can be set.
  • the terminal 30 controls the transmission of the UL signal or the reception of the DL signal by using the allocation information indicating the allocated frequency band, for example.
  • terminal 30 has the first transmission parameter (for example, UL shown in FIG. 10) corresponding to the reception parameter (for example, parameter related to the configuration of the frequency band assigned to DL) used for DL reception.
  • the second transmission parameter for example, the parameter regarding the frequency band assigned to the UL shown in FIG. 11
  • the terminal 30 performs UL transmission in a frequency band having a center frequency different from the center frequency in DL reception, based on the second transmission parameter.
  • the terminal 30 can improve the throughput of UL by wideband transmission in UL. Further, in the DL, the frequency utilization efficiency of the DL can be improved by aligning the configuration of the frequency band (for example, CC) assigned to the terminal 30 with the configuration of the frequency band assigned to another terminal.
  • the frequency band for example, CC
  • the processing in CC units of 100 MHz is performed, and the wireless processing (RF (Radio Frequency) processing) is performed. May perform processing in units of allocated band (400 MHz in FIG. 11).
  • RF Radio Frequency
  • the base station 20 is the UL reception dedicated station.
  • the base station 20 does not have to be a UL reception dedicated station.
  • the base station 20 may include a configuration regarding the DL transmission process in addition to the configuration regarding the UL reception process.
  • a plurality of base stations having both DL transmission processing and UL reception processing may be arranged in high density.
  • at least one of the plurality of base stations may perform the UL reception process without performing the DL transmission process, as in the base station 20 illustrated in FIG. 4.
  • the terminal 30 for example, UL transmission band, communication environment, service content, etc.
  • the terminal is connected to the same base station in both DL and UL as shown in FIG.
  • the case where the terminal is connected to different base stations in DL and UL as shown in FIG. 4 may be switched.
  • the parameter may be a parameter related to beam control, TA control, and other processing different from frequency band setting.
  • each functional block may be realized by using one device physically or logically coupled, or directly or indirectly (for example, two or more devices physically or logically separated). , Wired, wireless, etc.) and may be implemented using these multiple devices.
  • the functional blocks may be realized by combining the one device or the plurality of devices with software.
  • Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, observation, Broadcasting, notifying, communicating, forwarding, configuration, reconfiguring, allocating, mapping, assigning, etc., but not limited to these.
  • a functional block (component) that functions for transmission is called a transmitting unit or a transmitter.
  • the implementation method is not particularly limited.
  • the base station, the user terminal, and the like according to the embodiment of the present disclosure may function as a computer that performs the process of the wireless communication method of the present disclosure.
  • FIG. 12 is a diagram illustrating an example of a hardware configuration of the base station 10, the base station 20, and the terminal 30 according to the embodiment of the present disclosure.
  • the base station 10, the base station 20, and the terminal 30 described above are physically computer devices including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. It may be configured.
  • the word “device” can be read as a circuit, device, unit, or the like.
  • the hardware configurations of the base station 10, the base station 20, and the terminal 30 may be configured to include one or a plurality of each device illustrated in the drawing, or may be configured not to include some devices. ..
  • Each function in the base station 10, the base station 20, and the terminal 30 causes the processor 1001 to perform an arithmetic operation by loading predetermined software (program) on hardware such as the processor 1001, the memory 1002, and the communication by the communication device 1004. Is controlled, and at least one of reading and writing of data in the memory 1002 and the storage 1003 is controlled.
  • predetermined software program
  • the processor 1001 operates an operating system to control the entire computer, for example.
  • the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, a register, and the like.
  • CPU central processing unit
  • the control units 101, 201, 301 and the like described above may be realized by the processor 1001.
  • the processor 1001 reads a program (program code), software module, data, and the like from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
  • a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used.
  • the control units 101, 201, and 301 of the base station 10, the base station 20, and the terminal 30 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and the other functional blocks are similarly processed. May be realized.
  • the various processes described above are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001.
  • the processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from the network via an electric communication line.
  • the memory 1002 is a computer-readable recording medium, and is composed of at least one of, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. May be done.
  • the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
  • the memory 1002 can store an executable program (program code), a software module, or the like for implementing the wireless communication method according to the embodiment of the present disclosure.
  • the storage 1003 is a computer-readable recording medium, for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu-ray disc). (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like.
  • the storage 1003 may be called an auxiliary storage device.
  • the storage medium described above may be, for example, a database including at least one of the memory 1002 and the storage 1003, a server, or another appropriate medium.
  • the communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, or the like.
  • the communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of a frequency division duplex (FDD: Frequency Division Duplex) and a time division duplex (TDD: Time Division Duplex). May be composed of
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside.
  • the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
  • Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
  • the bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.
  • the base station 10, the base station 20, and the terminal 30 include a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include hardware such as, and the hardware may implement part or all of each functional block. For example, the processor 1001 may be implemented using at least one of these hardware.
  • DSP digital signal processor
  • ASIC Application Specific Integrated Circuit
  • PLD Programmable Logic Device
  • FPGA Field Programmable Gate Array
  • the notification of information is not limited to the aspect/embodiment described in the present disclosure, and may be performed using another method.
  • the information is notified by physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by notification information (MIB (Master Information Block), SIB (System Information Block)), another signal, or a combination thereof.
  • the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration message, or the like.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • SUPER 3G IMT-Advanced
  • 4G 4th generation mobile communication system
  • 5G 5th generation mobile communication system
  • FRA Full Radio Access
  • NR new Radio
  • W-CDMA registered trademark
  • GSM registered trademark
  • CDMA2000 Code Division Multiple Access 2000
  • UMB Universal Mobile Broadband
  • IEEE 802.11 Wi-Fi (registered trademark)
  • IEEE 802.16 WiMAX (registered trademark)
  • IEEE 802.20 UWB (Ultra-WideBand
  • Bluetooth registered trademark
  • the specific operation performed by the base station may be performed by its upper node in some cases.
  • the various operations performed for communication with a terminal are the base station and other network nodes other than the base station (eg MME or S-GW and the like are conceivable, but not limited to these).
  • MME or S-GW network nodes other than the base station
  • a combination of a plurality of other network nodes for example, MME and S-GW may be used.
  • Input/output direction Information, signals, and the like can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input/output may be performed via a plurality of network nodes.
  • the input/output information and the like may be stored in a specific place (for example, a memory) or may be managed using a management table. Information that is input/output may be overwritten, updated, or added. The output information and the like may be deleted. The input information and the like may be transmitted to another device.
  • the determination may be performed based on a value represented by 1 bit (0 or 1), may be performed based on a Boolean value (Boolean: true or false), or may be compared by numerical values (for example, a predetermined value). (Comparison with the value).
  • software, instructions, information, etc. may be sent and received via a transmission medium.
  • the software uses a wired technology (coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL: Digital Subscriber Line), etc.) and/or wireless technology (infrared, microwave, etc.) websites, When sent from a server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.
  • wired technology coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL: Digital Subscriber Line), etc.
  • wireless technology infrared, microwave, etc.
  • Information, signal The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies.
  • data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description include voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any of these. May be represented by a combination of
  • At least one of the channel and the symbol may be a signal (signaling).
  • the signal may also be a message.
  • a component carrier CC may be called a carrier frequency, a cell, a frequency carrier, or the like.
  • the information, parameters, and the like described in the present disclosure may be represented by using an absolute value, may be represented by using a relative value from a predetermined value, or by using other corresponding information. May be represented.
  • the radio resources may be those indicated by the index.
  • base station In the present disclosure, “base station (BS)”, “radio base station”, “fixed station”, “NodeB”, “eNodeB (eNB)”, “gNodeB (gNB)”, “"Accesspoint”,”transmissionpoint”,”receptionpoint”,”transmission/receptionpoint”,”cell”,”sector”,”cellgroup”,”
  • carrier “component carrier” and the like may be used interchangeably.
  • a base station may be referred to by terms such as macro cell, small cell, femto cell, pico cell, and the like.
  • a base station can accommodate one or more (eg, three) cells.
  • the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH: It is also possible to provide communication services by Remote Radio Head).
  • RRH small indoor base station
  • the term "cell” or “sector” means part or all of the coverage area of at least one of the base station and the base station subsystem that perform communication services in this coverage. Refers to.
  • a mobile station can be a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless, by a person skilled in the art. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
  • At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like.
  • the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like.
  • the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned).
  • At least one of the base station and the mobile station also includes a device that does not necessarily move during a communication operation.
  • at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.
  • IoT Internet of Things
  • the base station in the present disclosure may be replaced by the user terminal.
  • the communication between the base station and the user terminal is replaced with communication between a plurality of user terminals (eg, may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.).
  • D2D Device-to-Device
  • V2X Vehicle-to-Everything
  • Each aspect/embodiment of the present disclosure may be applied to the configuration.
  • the user terminal 20 may have the function of the above-described base station 10.
  • the wording such as “up” and “down” may be replaced with the wording corresponding to the communication between terminals (for example, “side”).
  • the uplink channel and the downlink channel may be replaced with the side channel.
  • the user terminal in the present disclosure may be replaced by the base station.
  • the base station 10 may have the function of the user terminal 20 described above.
  • determining and “determining” used in the present disclosure may include a wide variety of operations.
  • “Judgment” and “decision” are, for example, judgment, calculation, computing, processing, processing, deriving, investigating, and looking up, search, inquiry. (Eg, searching in a table, a database, or another data structure), considering ascertaining as “judging” or “deciding” may be included.
  • “decision” and “decision” include receiving (eg, receiving information), transmitting (eg, transmitting information), input (input), output (output), access (accessing) (for example, accessing data in a memory) may be regarded as “judging” and “deciding”.
  • judgment and “decision” are considered to be “judgment” and “decision” when things such as resolving, selecting, choosing, establishing, establishing, and comparing are done. May be included. That is, the “judgment” and “decision” may include considering some action as “judgment” and “decision”. In addition, “determination (decision)” may be read as “assuming,” “expecting,” “considering,” and the like.
  • connection means any direct or indirect connection or coupling between two or more elements, and It can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled”.
  • the connections or connections between the elements may be physical, logical, or a combination thereof.
  • connection may be read as “access”.
  • two elements are in the radio frequency domain, with at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-exhaustive examples. , Can be considered to be “connected” or “coupled” to each other, such as with electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions.
  • the reference signal may be abbreviated as RS (Reference Signal), or may be referred to as a pilot (Pilot) depending on the applied standard.
  • RS Reference Signal
  • Pilot pilot
  • the phrase “based on” does not mean “based only on,” unless expressly specified otherwise. In other words, the phrase “based on” means both "based only on” and “based at least on.”
  • any reference to elements using designations such as “first”, “second”, etc. as used in this disclosure does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.
  • Parts in the configuration of each of the above devices may be replaced with “means”, “circuits”, “devices”, and the like.
  • a radio frame may be composed of one or more frames in the time domain. Each frame or frames in the time domain may be referred to as a subframe. A subframe may also be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
  • Numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel.
  • Numerology includes, for example, subcarrier spacing (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, radio frame configuration, transmission/reception
  • SCS subcarrier spacing
  • TTI Transmission Time Interval
  • At least one of a specific filtering process performed by the device in the frequency domain and a specific windowing process performed by the transceiver in the time domain may be indicated.
  • a slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain.
  • a slot may be a time unit based on numerology.
  • a slot may include multiple minislots. Each minislot may be composed of one or more symbols in the time domain. The minislot may also be called a subslot. Minislots may be composed of fewer symbols than slots.
  • PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be referred to as PDSCH (or PUSCH) mapping type A.
  • PDSCH (or PUSCH) transmitted using a minislot may be referred to as PDSCH (or PUSCH) mapping type B.
  • the radio frame, subframe, slot, minislot, and symbol all represent a time unit for transmitting a signal.
  • Radio frames, subframes, slots, minislots, and symbols may have different names corresponding to them.
  • one subframe may be called a Transmission Time Interval (TTI)
  • TTI Transmission Time Interval
  • a plurality of consecutive subframes may be called a TTI
  • one slot or one minislot is called a TTI.
  • TTI Transmission Time Interval
  • TTI means, for example, the minimum time unit of scheduling in wireless communication.
  • the base station performs scheduling to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) to each user terminal in units of TTI.
  • the definition of TTI is not limited to this.
  • the TTI may be a transmission time unit of a channel-encoded data packet (transport block), code block, codeword, or the like, or may be a processing unit of scheduling, link adaptation, or the like.
  • the time interval for example, the number of symbols
  • the transport block, code block, codeword, etc. may be shorter than the TTI.
  • one slot or one minislot is called a TTI
  • one or more TTIs may be the minimum time unit for scheduling.
  • the number of slots (minislot number) that constitutes the minimum time unit of the scheduling may be controlled.
  • a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
  • the TTI shorter than the normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
  • a long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (eg, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.
  • a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or more continuous subcarriers in the frequency domain.
  • the number of subcarriers included in the RB may be the same regardless of the numerology, and may be 12, for example.
  • the number of subcarriers included in the RB may be determined based on numerology.
  • the time domain of the RB may include one or more symbols, and may be one slot, one minislot, one subframe, or one TTI in length.
  • Each 1 TTI, 1 subframe, etc. may be configured with one or a plurality of resource blocks.
  • one or more RBs include a physical resource block (PRB: Physical RB), a subcarrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, etc. May be called.
  • PRB Physical resource block
  • SCG Sub-Carrier Group
  • REG Resource Element Group
  • a resource block may be composed of one or more resource elements (RE: Resource Element).
  • RE Resource Element
  • one RE may be a radio resource area of one subcarrier and one symbol.
  • a bandwidth part (may also be called a partial bandwidth) represents a subset of continuous common RBs (common resource blocks) for a certain neurology in a certain carrier. Good.
  • the common RB may be specified by the index of the RB based on the common reference point of the carrier.
  • PRBs may be defined in a BWP and numbered within that BWP.
  • BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP).
  • BWP for UL
  • DL BWP BWP for DL
  • One or more BWPs may be set in one carrier for the UE.
  • At least one of the configured BWPs may be active, and the UE does not have to assume that it will send and receive predetermined signals/channels outside the active BWP.
  • BWP bitmap
  • the above-described structure of the radio frame, subframe, slot, minislot, symbol, etc. is merely an example.
  • the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, and the number included in RB The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP: Cyclic Prefix) length, and the like can be variously changed.
  • each aspect/embodiment described in the present disclosure may be used alone, in combination, or may be switched according to execution.
  • the notification of the predetermined information (for example, the notification of “being X”) is not limited to the explicit notification, but is performed implicitly (for example, the notification of the predetermined information is not performed). Good.
  • One aspect of the present disclosure is useful for wireless communication systems.
  • Radio base station 30 Terminal 101, 201, 301 Control unit 102, 303 Transmission unit 202, 302 Reception unit
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JP2020558791A JP7217291B2 (ja) 2018-12-07 2018-12-07 端末及び通信方法
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